Geomechanics and Engineering

  • 제29권5호
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  • Pages.509-522
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  • 2022
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  • 2005-307X(pISSN)
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  • 2092-6219(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Field test and numerical study of the effect of shield tail-grouting parameters on surface settlement

  • Shao, Xiaokang (School of Mechanics and Civil Engineering, China University of Mining and Technology-Beijing) ;
  • Yang, Zhiyong (School of Mechanics and Civil Engineering, China University of Mining and Technology-Beijing) ;
  • Jiang, Yusheng (School of Mechanics and Civil Engineering, China University of Mining and Technology-Beijing) ;
  • Yang, Xing (School of Mechanics and Civil Engineering, China University of Mining and Technology-Beijing) ;
  • Qi, Weiqiang (School of Mechanics and Civil Engineering, China University of Mining and Technology-Beijing)
  • 투고 : 2022.01.31
  • 심사 : 2022.04.26
  • 발행 : 2022.06.10
⟨ 이전 논문 다음 논문 ⟩

초록

Tail-grouting is an effective measure in shield engineering for filling the gap at the shield tail to reduce ground deformation. However, the gap-filling ratio affects the value of the gap parameters, leading to different surface settlements. It is impossible to adjust the fill ratio indiscriminately to study its effect, because the allowable adjustment range of the grouting quantity is limited to ensure construction site safety. In this study, taking the shield tunnel section between Chaoyanggang Station and Shilihe Station of Beijing Metro Line 17 as an example, the correlation between the tail-grouting parameter and the surface settlement is investigated and the optimal grouting quantity is evaluated. This site is suitable for conducting field tests to reduce the tail-grouting quantity of shield tunneling over a large range. In addition, the shield tunneling under different grouting parameters was simulated. Furthermore, we analyzed the evolution law of the surface settlement under different grouting parameters and obtained the difference in the settlement parameters for each construction stage. The results obtained indicate that the characteristics of the grout affect the development of the surface settlement. Therefore, reducing the setting time or increasing the initial strength of the grout could effectively suppress the development of surface subsidence. As the fill ratio decreases, the loose zone of the soil above the tunnel expands, and the soil deformation is easily transmitted to the surface. Meanwhile, owing to insufficient grout support, the lateral pressure on the tunnel segments is significantly reduced, and the segment moves considerably after being removed from the shield tail.

키워드

과제정보

This study was financially supported by the National Natural Science Foundation of China (Grant No. U1261212). The first and corresponding authors would also like to acknowledge the support provided by the China Railway 12th Bureau Group.

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